With regards to teamplay, as much as i'd like to see it happen, we probably won't see it for a long while. The game is still relatively new and people are having to get used to the fact that they can't fight alone. As people become more battle-hardened they might become more aware of helping each other.

I myself can only recall one instance of someone using teamwork with me - a support player noticed my tanks were getting pummelled by choppers, so he followed me around with heavy AA. We completely owned the enemy and won the game.